Sea Six wrote:
We get 40-50° temperatures at night typically. Occasionally it will get into the 30's and we will have a few days of subfreezing weather per year.
I have a heat pump in the main ac but the reversing valve has failed so it's just an ac for now.
A modern, high efficiency heat pump, one specifically design to operate do to about 0F is the most cost effective form of heat. If you could retro fit one of these residential "mini-split" heat pumps into you 5er your electric cost would go way down for both heating and cooling.
